Contents

defmodule Allergies do
  import Bitwise

  @allergens [
    "eggs",
    "peanuts",
    "shellfish",
    "strawberries",
    "tomatoes",
    "chocolate",
    "pollen",
    "cats"
  ]

  def list(flags) do
    Enum.with_index(@allergens)
    |> Enum.filter(&flagged?(flags, &1))
    |> Enum.map(fn {item, _} -> item end)
  end

  def allergic_to?(flags, item) do
    Enum.member?(list(flags), item)
  end

  defp flagged?(flags, {_, index}) do
    (flags &&& 1 <<< index) > 0
  end
end

Version data entries

131 entries across 131 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.179	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.178	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.177	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.176	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.175	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.174	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.173	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.172	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.171	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.170	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.169	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.167	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.166	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.165	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.164	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.163	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.162	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.161	tracks/elixir/exercises/allergies/example.exs
trackler-2.2.1.160	tracks/elixir/exercises/allergies/example.exs